Add special "equal to any of" verb for UPC-related grid filters

tailbone/grids/filters.py

@@ -130,6 +130,7 @@ class GridFilter(object):
         'is_any':               "is any",
         'equal':                "equal to",
         'not_equal':            "not equal to",
+        'equal_any_of':         "equal to any of",
         'greater_than':         "greater than",
         'greater_equal':        "greater than or equal to",
         'less_than':            "less than",
@@ -164,6 +165,7 @@ class GridFilter(object):
     ]
 
     multiple_value_verbs = [
+        'equal_any_of',
         'contains_any_of',
     ]
 
@@ -919,7 +921,7 @@ class AlchemyGPCFilter(AlchemyGridFilter):
     """
     GPC filter for SQLAlchemy.
     """
-    default_verbs = ['equal', 'not_equal']
+    default_verbs = ['equal', 'not_equal', 'equal_any_of']
 
     def filter_equal(self, query, value):
         """
@@ -961,6 +963,47 @@ class AlchemyGPCFilter(AlchemyGridFilter):
         except ValueError:
             return query
 
+    def filter_equal_any_of(self, query, value):
+        """
+        This filter expects "multiple values" separated by newline character,
+        and will add an "OR" condition with each value being checked via
+        "ILIKE".  For instance if the user submits a "value" like this:
+
+        .. code-block:: none
+
+           07430500132
+           07430500116
+
+        This will result in SQL condition like this:
+
+        .. code-block:: sql
+
+           (upc IN (7430500132, 74305001321)) OR (upc IN (7430500116, 74305001161))
+        """
+        if not value:
+            return query
+
+        values = value.split('\n')
+        values = [value for value in values if value]
+        if not values:
+            return query
+
+        conditions = []
+        for value in values:
+            try:
+                clause = self.column.in_((
+                    GPC(value),
+                    GPC(value, calc_check_digit='upc')))
+            except ValueError:
+                pass
+            else:
+                conditions.append(clause)
+
+        if not conditions:
+            return query
+
+        return query.filter(sa.or_(*conditions))
+
 
 class AlchemyPhoneNumberFilter(AlchemyStringFilter):
     """